By that I don't mean "ignore other people", only their effect on your comment score/karma. You should listen to their arguments nonetheless.
That's the problem with "Downvotes" in the way they're done here. Legitimate discourse, albeit unpopular will attract downvotes. And so will unrelated offtopic garbage (Spam, 1 word replies, crazy rantings ala TempleOS).
The end result to both "unpopular" material and "spam" is the same - hidden. Simply put, -1s = losing right to talk and be seen. So yeah, I am pretty disappointed in the community, and I have a justifiable right to be.
The HN community is what it is. It has certain norms and behaviors. By participating, you're part of it. If it doesn't operate in a way you prefer and you'd like to continue to contribute, be the change you want. Behave in the ways you want. I encourage you to do so! That said, if you want to be confrontational and argumentative rather than looking for points of agreement and teasing out more nuanced differences, I think you're likely to continue to see pushback on HN. In some sense, such behavior can be as corrosive as spam.